Very interesting thread. I've read just about all of the Indy novels, including the film adaptions.
I just read the Last Crusade novel, and came across a very weird part of the story, that was definately not in the film.
After Indy retrieves the Grail diary from Elsa in Berlin, he and his father board the derigable and at this point, Indy does not have his beloved jacket. Because he was wearing the Nazi uniform, with a big overcoat covering it up.
After the scuffle with Vogel, where he tosses him out the window, he figures he needs to cut off communications from the zepplin so they can't be alerted to the Jones boys being onboard.
He sneaks in the radio room, quick scuffle with the radio man, ties him up, yanks the wires, and directly quoted from the novel:
"Then he saw a leather jacket hanging from a hook. It looked alot like his own. He couldn't resist trying it on.
Another perfect fit"
Now, this has got to be one of the worst attempts at getting Indy back into costume yet.
I also think that altho I wish it weren't so, the hat has got to be replaceable. I've owned some very favorite baseball caps in my day, and even tried washing them, so as not to have to get rid of them so soon. After awhile, you've got to give up the ghost.
And baseball caps are cotton, and can be washed. Felt can get awful ripe after a nice long adventure fighting everything from Hovitos to Nazis, and then some.
Also, Indy lost his satchell in every film. Anyone ever notice that?
In Raiders, it's left on the boat,
in TOD, it's dropped so he can grab the falling Sankara stone,even tho they screwed up editing and had him wearing it immediately after Mola Ram falls, and on the trek back to the village.
And in LC, the Grail knight slashes at him with his sword, and cuts his strap, so the bag was left on the floor.
Just an observation